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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 836 |  | $ 664 | $ 1,622 | $ 1,609 |
Liability for payment of the RSTUs | 57,783 |  |  | $ 57,783 |  | $ 48,682
Employee Service-Based RSUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awarded in period (in shares) |  |  |  | 24,595 |  |
Employee Performance-Based RSUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awarded in period (in shares) |  |  |  | 45,615 |  |
Common stock issuable per RSU granted (in shares) |  |  |  | 1 |  |
Employee Performance-Based RSTUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock units non vested grants (in shares) |  |  |  | 4,057 |  |
Employee Service-Based RSTUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock units non vested grants (in shares) |  |  |  | 2,243 |  |
RSTUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period, years |  |  |  | 3 years |  |
Stock-based compensation expense | (100) | $ 400 |  | $ 200 | $ 100 |
Liability for payment of the RSTUs | $ 400 |  |  | $ 400 |  | $ 1,000
Cliff Vest [Member] | RSUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period, years |  |  |  | 3 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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